books.google.com.ec - By any measure, the Pythagorean theorem is the most famous statement in all of mathematics, one remembered from high school geometry class by even the most math-phobic students. Well over four hundred proofs are known to exist, including ones by a twelve-year-old Einstein, a young blind girl, Leonardo...http://books.google.com.ec/books/about/The_Pythagorean_Theorem.html?id=Z5VoBGy3AoAC&utm_source=gb-gplus-shareThe Pythagorean Theorem
